Experienced and professional animal trainer provide their insights in answering this question :
A. If the malformation has always been there and it doesn`t bother her then leave her be. If it is something that has recently occurred then get her checked over by your vet.

How to Identify Common Pet Problems ?

Our sources include academic articles, blog posts, and personal essays from experienced pet care professionals :

If you spot any abnormal lump or bump on your cat, you should contact your veterinarian. While lipomas are not life-threatening, other causes of bumps can have more serious side effects. There is nothing you can do to prevent your pet from getting lipomas.
Chest bone deformity in cats typically refers to a common deformity known as “funnel chest,” which is known by the medical term “pectus excavatum”. Pectus excavatum is a condition in which the chest bone (sternum) and the ribs to which it is connected grow abnormally.
Flat-chested kitten syndrome (FCKS) is a disorder in cats wherein kittens develop a compression of the thorax (chest/ribcage) caused by lung collapse. This is a soft-tissue problem and is not caused by vertebral or bony malformation.
You may suspect that a kitten has pectus excavatum if you notice the following symptoms: Irregularly flat or small chest. Irregular shape to the ribs. Chest seeming to dip inwards with each breath.
Fatty tumors, called lipomas, may show up anywhere on a cat`s body. They aren`t cancerous and don`t need to be removed unless they keep your cat from getting around well. They`re seen more often in older or overweight cats. To check a lump for cancer, your vet will use a needle to get a sample.
Symptoms of Cat Mammary Gland Tumors

The most common symptom of a cat mammary gland tumor is a lump or swelling along the cat`s mammary chain, which is the line of breast tissue and nipples along your cat`s belly. The mass may be soft or firm, widespread or clearly defined.

A chest wall deformity is a structural abnormality of the chest that can range from mild to severe. Chest wall deformities occur when the cartilage that connects the ribs grows unevenly. It is not clear why this happens, but the condition tends to run in families.
Some rib deformities occur as a result of genetic mutations. These may be inherited from one or both parents or may occur spontaneously as de novo gene mutations. In other cases, there is no known cause for the rib abnormalities.
There is no treatment for Ehlers-danlos syndrome in animals. Severely affected kittens usually do not survive, but cats with mild or moderate forms generally live a normal lifespan, but are at risk of frequent skin tears and injury due to skin fragility and joint laxity.
One of the key indicators of a healthy kitten is their body condition. When gently touching your kitten`s sides, you should be able to feel, but not see, their ribs. A healthy kitten will have a discernible waistline and a slight tummy tuck.
Most of the time, the warble is found just under a cat`s skin and causes the following symptoms: Red swelling, approximately 1 inch wide with a hole in the top (there may be more than one) Moving gray-brown worm-like creature, seen through the swelling hole, covered in small black spines.
When the sternal manubrium is prominent, the deformity is often called “pigeon breast,” while the more common chondrogladiolar prominence, in which the body of the sternum protrudes, is referred to as “chicken breast.” The deformity can be symmetric or unilateral, with a rightward tilt of the sternum the more common …
Bumps in pets tend to fall into one of the following categories: An infection or abscess. A reaction to something foreign in the body (also called a granuloma) A tumor (either benign or malignant)
Cancerous lumps in cats are not always soft or hard — Some can be hard and others soft, while others also change from soft to hard with time. Cancerous lumps in the cat have one thing in common, they spread quickly in other parts of their body.
Lipomas in cats are not very common but they can form on various parts of the body, typically in cats 10 years of age or older. While a cat may have one or more lipomas, they do not spread, they tend to not grow very large and they are not painful.
Skin changes

“It could be benign or cancerous, but it`s always easier to treat the earlier it`s caught.” Feel for bumps, lumps, or swelling as you pet your cat. If you notice something iffy, don`t delay—there`s no way to distinguish between a lump that`s benign or malignant without taking a sample.

Recovery of Mammary Cancer in Cats

Cats with tumors between 2 and 3cm may survive fur up to two years and cats whose tumors are larger than 3cm may survive for up to six months. If the cat`s treatment for small tumors that were caught early is aggressive, the cat may live for between two and three years.

The most common reason for a lump forming on the ribs is something known as a lipoma, which is a collection of fatty tissue. This type of lump can lie beneath the surface of the skin covering a rib. They are usually painless, freely mobile under your fingers and stay the same over time.
The right upper quadrant of the ribs covers the pancreas, right kidney, gallbladder, liver, and intestines. Pain under the ribs in this area can indicate a health problem affecting one of these organs.
Rib flare is the term used to describe a posture that causes the lower ribs to protrude forwards. It usually is accompanied by breastbone elevation, an upper back that is too straight or arches the opposite way, and shoulder blades pulled back excessively.
Rib dysfunction describes a problem at the joint between the rib head and the thoracic spine. Pain is experienced due to improper gliding of the rib head or jamming of the rib head at the joint.
floating rib. noun. : a rib (as one of the two bottom pairs in human beings) that has no attachment to the sternum.
Bifid rib is a rare congenital abnormality of the anterior chest wall. It manifests as a painless “lump” of the chest wall. A single bifid rib is most commonly a normal incidental finding discovered during a routine physical examination and/or chest radiography which is often performed for other reasons(1).
This results in a variety of clinical signs including loose, hyperextensible, fragile skin, joint laxity and other connective tissue dysfunctions. Clinical signs include fragile skin from the time of birth, wounds that heal with thin scars, delayed wound healing, pendulous skin, hematoma and hygroma formation.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My kitten Spooky seems to have a mal-formed rib cage on her right side only, but it doesn’t seem to bother her. Any advice?
ANSWER : A. If the malformation has always been there and it doesn`t bother her then leave her be. If it is something that has recently occurred then get her checked over by your vet.

Read Full Q/A … : Vetinfo

Q. I’m fostering some kittens & 1 of them feels like she may have a mal-formed rib cage on 1 side but doesn’t seem to favor it. Any advice?
ANSWER : A. If it has always been like that and doesn`t cause her a problem then just monitor it. If it is something that has occurred more recently then take her to see your vet.

Q. i believe my cat is pregnant but showing signs of being in heat
ANSWER : A. Cats are induced ovulators, meaning they will continue to go into heat until they are bred, or spayed (reproductive organs removed). If your cat is showing signs of being in heat (excessive yowling, presenting her rear to you for inspection, attempting to get out or other cats hanging near your house) and you don’t want kittens, it is best to have her spayed. Most cats are also semi-seasonal in their heat cycle meaning they will more likely be in heat through Spring-Summer than in Fall-Winter.

Pregnancy in cats lasts about 60 days. Signs of pregnancy may include weight gain, increased appetite, nipples that become pronounced or “leak” and seeking nesting areas to deliver kittens. If you saw that your cat was in heat, or had her mated, you can use the date she was bred to determine when she may be due for kittens. Your local vet can help determine if she is indeed pregnant and can also take an X-ray to determine the number of kittens present if your cat is nearing her due date. Be sure to feed mom a kitten formula in the last few weeks of her pregnancy and during nursing as it will help provide extra beneficial nutrients for both mom and babies.

If you do not want kittens, some very early term pregnancies can be aborted with spaying, otherwise spaying mom is usually done when kittens are weaned from their mom.

Q. My dog doesn’t like his cage, I leave him in it he chews up the bars trying to escape Now he has destroyed his cage, What can I do to change that?
ANSWER : A. Your dog has separation anxiety. You can start by making his cage seem “cozier” by covering the bottom with blankets and covering the top of the cage with blankets to make it like a den. Begin feeding your dog in his cage and teach him to go into his crate for a treat. You can even sit beside him while he is in his crate and give him treats. Overall you want to teach him that his crate is a good place where good things happen.

Q. I have a 1yr old male 38 lb Labradoodle and my gf just brought a month old kitten home. Can they interact? If not, for how long?
ANSWER : A. Interactions whenever a new pet is brought into the house should start off slow, then can be increased in time. The best steps when introducing a new cat is to allow your cat or kitten to have a room in the house all to him or herself. Allow your dog to sniff under the door to get used to the kitten’s scent, and even show your dog articles such as bedding the cat has slept on. After a few days, an introduction with your dog on leash, or a barrier such as a gate where both pets can look at each other but not see each other is best. This will allow each to get used to seeing the other without the ability to jump, bite or scratch the other. Once the two are used to this, then a face to face interaction can begin. If at any time a fight or scuffle breaks out, separate the two pets and try again at a later time. The amount of time this introduction takes can vary depending on how the two react to each other.

Until your kitten is older, or you are sure both are fine together, do not leave the two pets together unattended. Even a well-meaning and playful dog can accidentally break a leg of a kitten or worse without meaning to! A safe room for your kitten to be in while you are away, or a barrier to allow your kitten to escape to safety if needed will help until both are big enough to play alone safely.

Read Full Q/A … : Dogs and Jealousy

Q. Kitten showed up at my door. Was fine till two days ago, now cant poop and wont eat. Very listless and blotted
ANSWER : A. Thank you for taking care of this kitten! It sounds like the kitten may be quite sick. First, you can try to stimulate it to poop by rubbing its anus gently with a warm, damp washcloth. If this doesn’t work, you should go to the vet right away – don’t wait until Monday – because a kitten who’s not eating can become hypoglycemic and get dangerously sick fast. Even if it gets better today, you should make a vet appointment soon because it will need to be dewormed – it almost certainly has parasites – and to get vaccinated depending on how old it is.

Q. My kitten (7 Months old) has a lump on the right side just past the rib cage. It feels like a large pimple or boyle. Any suggestion? Thanks
ANSWER : A. Without examination it is impossible to say but it could be a tick or possibly a botfly larvae. If it is causing any discomfort, getting bigger or doesn’t go in a day then I would recommend having it checked by your vet.

Q. I recently added a new 2 month old female kitten to my house and my male 5 month the old kitten has turned aggressive and chases the kitten down..
ANSWER : A. It is possible it could be play behavior but without seeing it in person, hard to say. Is the male kitten neutered? You may want to consider doing so. Also, try re-introducing the kittens slowly by creating a safe space for the new kitten behind a closed door in a room. Keep her there for at least a week so she is protected but your male is still able to smell her. After a week or 2, you can then graduate to using a baby gate so they can then not only smell each other but safely see each other as well. If that is going okay, after another few days you can bring the gate down. Also, be sure to have feeding bowls in separate locations and at least 2 litter boxes.

Read Full Q/A … : Ragdoll Cats